/Engine/Source/Runtime/Core/Public/Math/Color.h
Converts from a linear float color to RGBE as outlined in Gregory Ward's Real Pixels article, Graphics Gems II, page 80. Implementation details inhttps://cbloomrants.blogspot.com/2020/06/widespread-error-in-radiance-hdr-rgbe.html
[FColor](API\Runtime\Core\Math\FColor) ToRGBE() const